638226545 has 8 divisors (see below), whose sum is σ = 835496640. Its totient is φ = 464164720.

The previous prime is 638226521. The next prime is 638226581. The reversal of 638226545 is 545622836.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 638226545 - 2⁸ = 638226289 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5802005 + ... + 5802114.

It is an arithmetic number, because the mean of its divisors is an integer number (104437080).

Almost surely, 2^638226545 is an apocalyptic number.

It is an amenable number.

638226545 is a deficient number, since it is larger than the sum of its proper divisors (197270095).

638226545 is a wasteful number, since it uses less digits than its factorization.

638226545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11604135.

The product of its digits is 345600, while the sum is 41.

The square root of 638226545 is about 25263.1459838239. The cubic root of 638226545 is about 860.9771410992.

The spelling of 638226545 in words is "six hundred thirty-eight million, two hundred twenty-six thousand, five hundred forty-five".